Study on Phase Change Energy Storage Materials in Building Energy Saving

Abstract

In order to prepare porous matrix phase change energy storage materials suitable for building energy saving, the fatty acids, such as stearic acid, lauric acid and capric acid, which are easy to be obtained, are selected as raw materials for the experiment. Three eutectic composite phase change materials with different melting points are prepared to meet the needs of different summer temperatures. The latent heat of capric acid/stearic acid composite is 149.3J/g, and the latent heat of capric acid/lauric acid composite is 126.7J/g, and the latent heat of lauric acid / stearic acid is 161.9J/g. In order to test the stability of phase change process of phase change materials, the experiment of heat storage and release is carried out at 15°C to 40°C. The results show that the stability of phase change materials is good. The expanded perlite with porous media is used as carrier and is combined with the phase change material by direct immersion method. The scanning electron microscope shows that the phase change material could be filled with the pores of expanded perlite. The test shows that latent heat of expanded perlite incorporated with three phase change materials is 105.5J/g, 74.41J/g and 96.2J/g.